Fix ChromeOS compilation after r321565

TBR=yurys,smckay
NOTRY=true

Review URL: https://codereview.chromium.org/1022153002

Cr-Commit-Position: refs/heads/master@{#321584}

content/renderer/devtools/v8_sampling_profiler.cc

@@ -445,8 +445,8 @@ void V8SamplingThread::HandleProfilerSignal(int signal,
   mcontext_t& mcontext = ucontext->uc_mcontext;
   v8::RegisterState state;
 
-#if defined(OS_ANDROID)
-  // TODO(alph): Add support for Android
+#if defined(OS_ANDROID) || defined(OS_CHROMEOS)
+  // TODO(alph): Add support for Android and ChromeOS
   ALLOW_UNUSED_LOCAL(mcontext);
 
 #elif defined(OS_MACOSX)

content/renderer/devtools/v8_sampling_profiler_browsertest.cc

@@ -118,11 +118,11 @@ class V8SamplingProfilerTest : public RenderViewTest {
   TraceResultBuffer::SimpleOutput json_output_;
 };
 
-// TODO(alph): Implement on Windows and Android
+// TODO(alph): Implement on Windows, Android and ChromeOS.
 // The SamplingEventForTesting is fired when the framework collected at
 // least one JitCodeAdded event and one sample event.
 
-#if defined(OS_WIN) || defined(OS_ANDROID)
+#if defined(OS_WIN) || defined(OS_ANDROID) || defined(OS_CHROMEOS)
 #define MAYBE(x) DISABLED_##x
 #else
 #define MAYBE(x) x